Questions tagged [backflow-preventer]

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In desperate need of investigative plumber/house inspector [closed]

Looking for plumber/home inspector in the mid Atlantic area for new build (1yr) ongoing unsolved issue. In desperate need of competent help!
-2 votes
2 answers
746 views

Dishwasher water line not providing hot water

Have an odd situation that started a week or so ago. The dishwasher was running to completion and dishes were either still dirtyish or the dishwasher pod was not dissolved and the dishes basically ...
3 votes
2 answers
829 views

backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?

Ideal for use where Lead-Free valves are required. Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water ...
0 votes
0 answers
55 views

How to replace the backflow preventer in an old house?

My house is about 30 years old. The backflow preventer in my front yard looks old as well. One time, a person who did our lawn carelessly cut the 2 pipes (where two red arrows point) of the backflow ...
0 votes
1 answer
126 views

Should I leave main water off after my back flow preventer broke?

Due to unusually cold temps my back flow preventer (Febco 765-1) has frozen and broken. I was under the impression that my back flow preventer in my backyard was only relevant to my sprinkler system, ...
1 vote
1 answer
103 views

Remove leaky backflow preventer

I have a leaky backflow preventer I'm trying to remove. It's been on for most of 10 years, and we've got pretty hard water. I've drilled out the set screw: I have some channel locks that I can use to ...
0 votes
1 answer
82 views

Why is my lawn sprinkler backflow preventer failing?

I have 14 zones which work fine except for zone 6. When it starts water starts coming out of backflow preventer. I already changed the valve parts and solenoid. Is there any thing else I can check?
2 votes
1 answer
189 views

Do individual irrigation system branch pipes need backflow preventers?

I have an inground sprinkler system with 3 zones. The water line coming up from the basement is going to the valves and has a Wilkins backflow preventer on it. I am adding 2 new valves/zones for drip ...
0 votes
2 answers
6k views

Why is my sprinkler system backflow leaking after being winterized?

After having my sprinkler system winterized, I noticed water leaking from the spigot. I thought it would stop once all the extra water came out but it is still leaking after 1 week. I turned the ...
6 votes
2 answers
4k views

Water shut off valve and backflow preventer

I'm a new member here. I'm here to learn how to do DIY plumbing work.  How does my home's main water supply valve, backflow preventer, and Potter switch work?  Image 1. The Main water line enters the ...
2 votes
0 answers
417 views

Backflow prevention fixture on my sprinkler system has started leaking -- is teflon tape the appropriate fix?

The backflow valve on my irrigation system has developed a minor leak at the threads I am pointing to. It's outside and not super fast, so not super urgent, but I would like to get it fixed eventually....
0 votes
1 answer
769 views

Backflow preventer spewing water

I have a lf009mq2t watts backflow preventer which starts spewing water from its center nozzle anytime any of my three irrigation lines stops running (or if I run a hose while its valve is off). I can ...
0 votes
0 answers
661 views

One of multiple zones calls for heat, but all return lines get hot

We just installed new gas combi boiler (Lochinvar NKC199N), it is working but there is one issue that I don't quite understand. We have 4 zones (4 different circulation pumps, 4 thermostats), when ...
2 votes
1 answer
690 views

Do I need a backflow preventer before my yard hydrant

I have a yard hydrant installed in my front yard. It is connected directly to the water supply from the city. The yard hydrant has a drain at the bottom that allows water to drain from the hydrant ...
2 votes
1 answer
184 views

Can I eliminate irrigation vacuum breaker after installing upstream RPZ?

I have an atmospheric vacuum breaker on the feed from my meter to my lawn irrigation system. I am going to install a water-powered backup sump pump in the basement. (This uses city water pressure ...
-1 votes
4 answers
326 views

How to properly install irrigation system/garden faucet

I want to install an above ground irrigation system for our flowers (large flower farm). The part I am having trouble with is how to properly connect to the main water supply without having backflow. ...
0 votes
0 answers
236 views

vacuum breaker on hose bib (spigot)

We have a backflow preventor on the water spigot in the garage. A water hose is attached that has a sprayer on the end. Every time we turn the water off from the hose and even with the sprayer left ...
1 vote
1 answer
391 views

Can I seal a crack in a Zurn Wilkins 375 RP backflow preventer?

I noticed our backflow preventer was leaking, so I pulled out the assembly to see what the issue is and it looks like a decent-sized crack in the plastic above the relief valve. Is this something I ...
-1 votes
1 answer
300 views

How to replace this old backflow preventer with new one

I want to replace this old broken Pressure Vacuum Breaker Valve with new one. Problem is that all the new ones at HomeDepot and Lowes have outflow on the left side. Can someone show me with a sketch ...
2 votes
1 answer
1k views

I know there is a pressure vacuum breaker here, but what is the rest?

First, a labeled picture of the situation: There are three ends, two in the ground and one in the house. How can I figure out which way the water is flowing? There are four labeled valves (and one ...
0 votes
1 answer
1k views

Is a back flow valve needed to attach a washing machine?

I want to attach a washing machine to my apartment's water supply. The washing machine is simple and has one inlet and no internal heater. The apartment has both hot and cold water. I plan to attach ...
0 votes
1 answer
274 views

How to connect to black underground sprinker pipe

My backflow prevention device failed over the winter (nice large split, as you can see). I checked with the local city, and they won't let me replace like with like, so I'm going to install a Wilkins ...
1 vote
2 answers
1k views

Is my irrigation system winterized properly?

I had a sprinkler specialist come over today to winterize my sprinkler system. I live in northwestern oregon (portland) and I'm trying to figure out if he properly winterized the system or if I need ...
1 vote
1 answer
1k views

Can this water valve be replaced as a separate component?

Crack in bottom part of backflow preventer can you just replace this part or do you have to buy entire unit?? Thanks, Eileen
0 votes
0 answers
223 views

Irrigation system: Backflow Preventer -> Master Valve vs Master Valve -> Backflow Preventer

I am in the process of designing my irrigation system, and I saw many people install the backflow preventer (reduced pressure zone device) first and then connect to an automatic master valve. However,...
3 votes
1 answer
296 views

Why did my febco backflow preventer fail?

I'm working as a handyman for a non-profit, and they have an in-ground irrigation system that has been off for a while because "there was a geyser." I successfully determined that the geyser was ...
0 votes
1 answer
2k views

How to prevent the washing machine outlet from backflowing to other devices

I have a washing machine that drains into a sink standpipe. I also have a clothes dryer that drains to sewage or greywater plumbing. When I connect the two via a T-piece with the dryer inlet at the ...
0 votes
0 answers
34 views

access to backflow preventer assembly

My backflow preventer assembly access is in my basement and its right below the proposed vanity space in our proposed basement bathroom.(we have planned a 48 inch vanity , but if i cut down to a 36 ...
0 votes
1 answer
2k views

What type of Piping for Reduced Pressure Backflow Preventor for Irrigation System

Looking into installing a above ground reduced pressure backflow preventor for my irrigation system. Looking at many examples and videos online, I saw different types of piping from PVC, Copper and ...
0 votes
2 answers
1k views

Sprinkler System Low Pressure

Is there a way to determine if my sprinkler system has a pressure regulator installed? My neighbor and I both built our houses with the same builder at the same time, but had different landscaping ...
1 vote
0 answers
868 views

Reinstalling backflow preventer. Do I need glue or grease or anything else

I am going to reattach my backflow preventer today (save 125 vs calling company). Do I need to apply any plumber grease or pipe glue to the pvc portion? Here are some pics of the preventer and place ...
0 votes
0 answers
511 views

Is my vacuum breaker working properly?

I am in a newly rented house around 1 week and I don't know a thing about plumbing (not yet and I love projects for DIY). So my question is regarding this: I find this attached to the outdoor pipe ...